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may 07, 2015 cominco ltd. history incorporated in canada in 1906, cominco ltd. has emerged as a leading integrated zinc and copper producer. with mines in canada, the united states, chile, and peru, cominco is the worlds largest producer of zinc concentrate as well as the fourth-largest zinc metal refiner. additionally, cominco produces may 10, 2021 top five largest iron ore producing companies in the world in 2020. vale 300 million tonnes. brazilian miner vale was the worlds top producer of iron ore in 2020, with an output totalling just over 300 million tonnes a small decline from 2019 when it produced 302 million tonnes of the metallic ore. the caraj mine in northern cost of transporting pellets a factor. for the alaska-canada rail link to be economically viable, the cost of transportation of iron ore pellets would have to be no more than $15.75 per ton, according to the phase study, because iron ore is relatively low value.